Alexis, a former Navy reservist, was shot to death during the incident.
The broader department reviews reached similar conclusions. They said the department should cut the number of workers who hold security clearances, conduct better and routinely updated background checks, and establish a system to evaluate and handle employees who are potential threats.
Preventing violence in the workplace must start “long before someone enters an installation with a weapon,” the internal review said.
The Navy investigation placed the most blame against Alexis’ employers.
The report written by Navy Adm. John Richardson said Alexis’s behavior raised concerns among his supervisors and others and indicated he may harm others. Had such information been reported to the government and acted upon, it stated, Alexis’ authorization to secure facilities would have been revoked.
Alexis’ company temporarily withdrew his access to classified information after a series of bizarre complaints and police incidents last August during a business trip to Newport, R.I. Alexis complained that people were following him, making noise and using a microwave machine to “send vibrations through the ceiling” in his hotel room.
Defense Secretary Chuck Hagel said Tuesday the department will set up an automated program that will continuously pull information from law enforcement and other databases. It will send out alerts if damaging information about a security-cleared worker is discovered.
Hagel said an inside threat management center will analyze the automatic record checks and “help connect the dots.” He said he will consider cutting the number of workers with clearances — currently about 2.5 million — by at least 10 percent.